Skip to main content

Time factors of differentially preserved wood in two calcitic concretions in Pennsylvanian black shale from Indiana


Published 1975
SHOW MORE


A large concretion in the black shale above Springfield Coal Member (No. V), Desmoinesian Series, Pennsylvanian, from the Blackfoot #5 mine, Pike County, Indiana, contains a piece of fossil wood with excellent preservation of cell structure. Both ends of the wood extending outward to the extremities of the ovoid concretion are replaced by a black calcareous rock in which there is no fossil wood structure. These end zones have sharp contacts with the concretion matrix and their dimensions correspond to those of the fossil wood plus associated calcite veins. These relations indicate that the concretion must have been well-established before the wood had suffered any structural disintegration through bacterial activity. The preservation of the central section of the wood was the result of early concretion formation, while the ends continued to rot away as they were open to the environment. -- This is further evidence for the rapid early diagenetic origin of many concretions, particularlly those associated with well-preserved fossils

Includes bibliographical references (p. 192)

A large concretion in the black shale above Springfield Coal Member (No. V), Desmoinesian Series, Pennsylvanian, from the Blackfoot #5 mine, Pike County, Indiana, contains a piece of fossil wood with excellent preservation of cell structure. Both ends of the wood extending outward to the extremities of the ovoid concretion are replaced by a black calcareous rock in which there is no fossil wood structure. These end zones have sharp contacts with the concretion matrix and their dimensions correspond to those of the fossil wood plus associated calcite veins. These relations indicate that the concretion must have been well-established before the wood had suffered any structural disintegration through bacterial activity. The preservation of the central section of the wood was the result of early concretion formation, while the ends continued to rot away as they were open to the environment. -- This is further evidence for the rapid early diagenetic origin of many concretions, particularlly those associated with well-preserved fossils

Fieldiana series has been published as Geological Series by Field Columbian Museum (1895-1909) and Field Museum of Natural History (1909-1943), and as Fieldiana: Geology by Chicago Natural History Museum (1945-1966) and Field Museum of Natural History (1966-)


Volume Fieldiana, Geology, Vol.33, No.10
Publisher Chicago : Field Museum of Natural History
Pages 32
Possible copyright status NOT_IN_COPYRIGHT
Language English
Call number 5386108
Digitizing sponsor University of Illinois Urbana-Champaign
Book contributor University of Illinois Urbana-Champaign
Collection biodiversity; fieldiana

Full catalog record MARCXML

[Open Library icon]This book has an editable web page on Open Library.
[Biodiversity Heritage Library icon]This book is available with additional data at Biodiversity Heritage Library.

Reviews

There are no reviews yet. Be the first one to write a review.
PEOPLE ALSO FOUND
Biodiversity Heritage Library
by Brunner von Wattenwyl, Karl, 1823-1914; Fea, Leonardo, 1852-1903
1,321
0
0